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Will a 3.8 grand prix motor fit in Chevy Impala?

No, a 3.8L Grand Prix engine will not fit in a Chevy Impala without significant modifications, and even then it's highly unlikely to be a practical or worthwhile undertaking. The engine bays, mounting points, and ancillary components (like the transmission, wiring harness, and exhaust system) are vastly different between the two cars. The project would require extensive custom fabrication and engineering.